4-oxo pyridinecarboxamide derivatives as plant growth regulators

ABSTRACT

Novel pyridinecarboxamide derivatives having the general formula (I) ##STR1## or salts thereof wherein R is hydrogen atom, alkoxy group, aralkyloxy group or a group of --(CH 2 ) n  --R 1  wherein n is an interger from 1 to 3 and R 1  is hydrogen atom, hydroxy group, lower alkoxy group, mercapto group, lower alkylthio group, amino group, di-lower alkylamino group, C 3-11  alkyl group, lower alkenyl group, lower alkynyl group, cycloalkyl group, 5- or 6-membered heterocyclic group, or aryl group which may be substituted by one or two substituents of halogen, lower alkyl or lower alkoxy; 
     R 2  is halogen atom, lower alkyl group, hydroxy group, lower alkoxy group, aryloxy group, carboxy group or lower alkoxycarbonyl group; 
     R 3  is hydrogen atom, halogen atom or lower alkyl group, which possess plant growth inhibitory activities and also anti-inflammatory activity.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to novel compounds which belong to 1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamides. The compounds of this invention show growth inhibitory activities on plants and also anti-inflammatory activity.

2. Description of the Prior Arts

Some compounds belonging to 1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamides are found in the literature. In Yakugakuzassi, 101, 40 (1981), Kato et al. reported on four compounds, namely N-(4-chlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-4-oxo-N-phenyl-1-(phenylmethyl)-3-pyridinecarboxamide, 1,4-dihydro-N-(4-methoxyphenyl)-2,6-dimethyl-4-oxo-1-(phenylmethyl)-3- pyridinecarboxamide and N-(4-chlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(phenylmethyl)-3-pyridinecarboxamide, as one of the studies on reactivity of ketene derivatives but they did not refer to utility thereof. Canadian Pat. No. 1,115,278 [and also J. B. Pierce et al, J. Med. Chem. 25, 131(1982)], there are disclosed 4-pyridone compounds possessing anti-inflammatory activity, i.e., 1,4-dihydro-2,6-dimethyl-4-oxo-N, 1-diphenyl-3-pyridinecarboxamide, N,1-dibutyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N,1-didodecyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(4-chlorophenyl)-1-ethyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, etc.

On the other hand, 1,4-dihydro-4-oxo-3-pyridinecarboxylic acid derivatives as compounds which show plant growth regulating activity, especially chemical hybridizing activity, are known in Japanese Patent Unexamined Publication Nos. Sho 52(1977)-144,676 (see also U.S. Pat. No. 4,051,142) and Sho 57(1982)-114,573 (see also E.P. No. 40,082). However, plant growth inhibitory agents whose active ingredients are 1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamides as in the formula (I) shown below are not known.

SUMMARY OF THE INVENTION

This invention provides compounds of the formula (I) and salts thereof. ##STR2##

In the formula (I),

R is hydrogen atom, alkoxy group, aralkyloxy group or a group of --(CH₂)_(n) --R₁ wherein n is an integer from 1 to 3 and R₁ is hydrogen atom, hydroxy group, lower alkoxy group, mercapto group, lower alkylthio group, amino group, di-lower alkylamino group, C₃₋₁₁ alkyl group, lower alkenyl group, lower alkynyl group, cycloalkyl group, 5- or 6-membered heterocyclic group, or aryl group which may be substituted by one or two substituents of halogen, lower alkyl or lower alkoxy;

R₂ is halogen atom, lower alkyl group, hydroxy group, lower alkoxy group, aryloxy group, carboxy group or lower alkoxycarbonyl group;

R₃ is hydrogen atom, halogen atom or lower alkyl group.

DESCRIPTION OF PREFERRED EMBODIMENTS

The term "lower" used for lower alkyl, lower alkoxy or like group in this invention means a group containing 1-5 carbon atoms. Specifically, there may be mentioned as lower alkyl group methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl or isopentyl; as lower alkoxy group methoxy, ethoxy, propoxy, isopropoxy or butoxy; as lower alkoxycarbonyl group methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl or butoxycarbonyl; or as lower alkylthio group methylthio, ethylthio, propylthio, isopropylthio, butylthio or pentylthio. As lower alkenyl or lower alkynyl group may be mentioned vinyl, allyl, isopropenyl, 2-butenyl, 1,3-butadienyl, 2-pentenyl, 1,4-pentadienyl, 1,6-heptadienyl, 1-hexenyl, ethynyl or 2-propynyl.

Examples of alkoxy and aralkyloxy group as used in the definition of R include alkoxy groups containing 1-12 carbon atoms such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, pentyloxy, 2-methylbutoxy, hexyloxy, 2 (or 3)-methylpentyloxy, octyloxy, nonyloxy, decyloxy, dodecyloxy; aralkyloxy groups such as phenylmethoxy, phenethyloxy, phenylpropoxy or phenylbutoxy group which may be substituted by an alkyl or a halogen atom at the aryl ring.

Examples of cycloalkyl group include cyclopropyl, cyclopentyl and cyclohexyl.

Examples of the aryl group include phenyl and naphthyl.

Halogen atom includes chlorine, bromine and fluorine atom.

5- or 6-membered heterocyclic group includes 5- or 6-membered one containing one to three hetero atoms selected from nitrogen atom, oxygen atom and sulfur atom. The examples of the 5-membered heterocyclic group are furyl, tetrahydrofuryl, thienyl, thiazolyl, isothiazolyl, oxazolyl, isooxazolyl or pyrazolyl and the 6-membered heterocyclic group pyridyl, pyrimidinyl, pyrazinyl or pyridazinyl. These heterocyclic groups may be substituted by alkyl as methyl or ethyl, halogen atom or phenyl. When the heterocyclic group is substituted by phenyl, it may form a condensed ring combining the two adjacent carbon atoms in the heterocyclic group with phenyl group. Examples of the condensed ring are benzothiazolyl, benzofuryl, quinazolinyl or quinoxalinyl group.

The compound of the formula (I) in this invention may form an addition salt with an acid such as hydrochloric acid, sulfuric acid, phosphoric acid, methanesulfonic acid, p-toluenesulfonic acid or trifluoroacetic acid when sufficiently basic, and also form a salt with an inorganic base when it contains a carboxylic group. Such salts are also included in this invention.

The compound of the formula (I) in this invention may be prepared by any of the following methods.

Method A ##STR3## [R, R₂ and R₃ of the formula (II) are the same as those in the formula (I).]

This method comprises reacting a 3-aminocrotonic acid anilide derivative (II) or its tautomer with 2,2,6-trimethyl-4H-1,3-dioxin-4-one in an appropriate solvent (e.g., toluene or xylene) under heating at a temperature of e.g., 100° C.-140° C. 2-Ethyl-2,6-dimethyl-4H-1,3-dioxin-4-one is also useful in place of 2,2,6-trimethyl-4H-1,3-dioxin-4-one. Also, in this method, 3-aminocrotonic acid anilide derivative (II) is not necessarily required to be in its isolated form but may be in the form of the crude reaction mixture of an amine of the formula (III) with a compound of the formula (IV) ##STR4## [R, R₂ and R₃ in the formula (III) and (IV) are the same as those in the formula (I).] For the practical purpose it is convenient to use the crude reaction mixture as such.

(Method B) ##STR5## [R, R₂ and R₃ in the formula (III) and (V) are the same as those in the formula (I).]

This method comprises reacting a 4-pyrone compound (V) corresponding to the formula (I), i.e., 2,6-dimethyl-4-oxo-N-phenyl-4H-pyran-3-carboxamide with ammonia or an amine of the formula (III) or a salt thereof in an appropriate solvent (e.g., ethanol or water) at a temperature from room temperature to about 60° C. The amount of ammonia or the amine employed is equimolecular or more to the 4-pyrone compound or a large excess if needed. When the amine is used as its available salt, it is required to convert to its free form by addition of an organic or an inorganic base in an amount needed for neutralization or more.

(Method C) ##STR6## [R, R₂ and R₃ in the formula (VI) and (VII) are the same meaning as defined in the formula (I).]

This method comprises reacting a carboxylic acid corresponding to the formula (I), i.e., 1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxylic acid derivative (VI) with an aniline derivative (VII) in the presence of a condensing agent for dehydration. It is advantageous to use as the condensing agent for dehydration 1-substituted-2-halopyridinium salt and a tertiary amine according to the method described in e.g. Japanese Patent Unexamined Publication No. Sho 52(1977)-57,102.

(Method D)

This method is applicable to preparation of the compound of the formula (I) wherein R is hydrogen atom and comprises treating 1,4-dihydro-2,6-dimethyl-4-oxo-N-phenyl-1-(phenylmethyl)-3-pyridinecarboxamide under conditions of hydrogenolysis to convert into 1,4-dihydro-2,6-dimethyl-4-oxo-N-phenyl-3-pyridinecarboxamide. As the preferred reaction conditions, it is especially suitable to use a solvent of an alcohol such as methanol or ethanol, a hydrogen donor such as hydrogen gas or formic acid and a catalyst of palladium-carbon or palladium-black.

This invention is illustrated further by examples hereinafter. Also, growth-inhibitory activities on plants of the compounds of the invention are shown in reference examples.

Furthermore, related specific compounds in addition to the compounds shown in the examples are as follows;

1-(4-chlorophenylmethyl)-N-(2-fluorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-bromophenyl)-1-(4-chlorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(3-chloro-2-methylphenyl)-1-(4-chlorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-fluorophenyl)-1,4-dihydro-2,6-dimethyl-1-(4-methylphenylmethyl)-4-oxo-3-pyridinecarboxamide,

N-(2-bromophenyl)-1,4-dihydro-2,6-dimethyl-1-(4-methylphenylmethyl)-4-oxo-3-pyridinecarboxamide,

1-butyl-N-(2-fluorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-bromophenyl)-1-butyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(3-chloro-2-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide,

N-(3-chloro-2-methylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(3-chloro-2-methylphenyl)-1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-fluorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide,

N-(2-bromophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2-methylphenyl)-4-oxo-1-(2-thienylmethyl)-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-(2-thienylmethyl)-3-pyridinecarboxamide,

N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-thienylmethyl)-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,3-dimethylphenyl)-4-oxo-1-(2-thienylmethyl)-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-phenylmethyl-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1-(4-chlorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-1-(4-methylphenylmethyl)-4-oxo-3-pyridinecarboxamide,

1-(4-fluorophenylmethyl)-1,4-dihydro-2,6-dimethyl-N-(2,3-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

N-(2-ethyl-6-methylphenyl)-1-(4-fluorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-(3-pyridylmethyl)-3-pyridinecarboxamide,

N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(3-pyridylmethyl)-3-pyridinecarboxamide,

1-butyl-1,4-dihydro-N-(2-methoxycarbonylphenyl)-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-ethylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

1-(2-ethoxyethyl)-N-(2-ethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

1-[2-(4-chlorophenyl)ethyl]-N-(2-ethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,4-dimethylphenyl)-4-oxo-1-pentyl-3-pyridinecarboxamide,

1-hexyl-1,4-dihydro-2,6-dimethyl-N-(2,4-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-N-(2,4-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,5-dimethylphenyl)-4-oxo-1-pentyl-3-pyridinecarboxamide,

1-hexyl-1,4-dihydro-2,6-dimethyl-N-(2,5-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-N-(2,5-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

1-[2-(4-chlorophenyl)ethyl]-1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-(3-phenylpropyl)-3-pyridinecarboxamide,

1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-1-[2-(4-methylphenyl)ethyl]-4-oxo-3-pyridinecarboxamide,

1-[2-(4-chlorophenyl)ethyl]-N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(3-phenylpropyl)-3-pyridinecarboxamide,

N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-1-[2-(4-methylphenyl)ethyl]-4-oxo-3-pyridinecarboxamide,

N-(3-chloro-2-methylphenyl)-1-[2-(4-chlorophenyl)ethyl]-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(5-chloro-2-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide,

N-(5-chloro-2-methylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(5-chloro-2-methylphenyl)-1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-chloro-6-methylphenyl)-1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2-chlorophenyl)-1-[2-(4-chlorophenyl)ethyl]-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,5-dichlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide,

N-(2,5-dichlorophenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,5-dichlorophenyl)-1-(2-ethoxyethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,6-dichlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide,

N-(2,6-dichlorophenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,6-dichlorophenyl)-1-(2ethoxyethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,6-dichlorophenyl)-1-[2-(4-chlorophenyl)ethyl]-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide,

N-(2,3-dichlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-propyl-3-pyridinecarboxamide.

EXAMPLE 1 N-(2-chlorophenyl)-1-(4-chlorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide ##STR7## (Method A)

A mixture of 2.40 g (11.3 m mol) of N-(2-chlorophenyl)-3-oxo-butanamide, 1.61 g (11.3 m mol) of 4-chlorobenzylamine and 50 ml of toluene was refluxed for 1.5 hours, while the resulting water was removed through a Dean-Stark's water-separator. To the mixture was dropwise added a solution of 4.07 g (28.6 m mol) of 2,2,6-trimethyl-4H-1,3-dioxin-4-one in 10 ml of toluene within about 30 minutes. After refluxing further for one hour, the reaction mixture was cooled at room temperature to precipitate crystals of the title compound. The crystals separated by filtration were dried under vacuo to afford 3.19 g (yield: 70%) of the product having mp. 172.5°-175° C.

EXAMPLE 2 N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-1-(2-dimethylaminoethyl)-4-oxo-3-pyridinecarboxamide ##STR8## (Method B)

To a solution of 1.50 g (5.0 m mol) of N-(2,6-diethylphenyl)-2,6-dimethyl-4-oxo-4H-pyran-3-carboxamide (mp. 83.5°-84.5° C.) in 25 ml of ethanol and 5 ml of water was added 8.82 g (100 m mol) of N,N-dimethylethylenediamine, and stirred for 7 hours at room temperature. The reaction mixture was concentrated under vacuo and the solid residue was recrystallized from isopropyl ether to give 1.51 g (yield: 82%) of the title compound having mp. 121°-122° C.

EXAMPLE 3 1,4-dihydro-2,6-dimethyl-N-(2-methylphenyl)-4-oxo1-phenylmethyl-3-pyridinecarboxamide ##STR9## (Method C)

To a solution of 2.41 g (10.0 m mol) of 1,4-dihydro-2,6-dimethyl-4-oxo-1-phenylmethyl-3-pyridinecarboxylic acid and 3.60 g (12 m mol) of 2-chloro-1-methyl-pyridinium tosylate dissolved in 50 ml of chloroform, was added 2.43 g (24 m mol) of triethylamine and stirred for 30 minutes at room temperature. 1.10 g (10.3 m mol) of o-toluidine was added to the reaction mixture followed by stirring for 4 hours at room temperature. The reaction mixture, transferred to a separatory funnel, was washed with a saturated sodium bicarbonate solution. The organic layer was dried and concentrated in an usual manner to obtain a solid residue. The residue was recrystallized from toluene to give 0.78 g (yield: 21.5%) of the title compound having mp. 170.5°-174° C.

EXAMPLE 4 1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-3-pyridinecarboxamide ##STR10## (Method D)

To a solution of 3.00 g (8.32 m mol) of 1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-phenylmethyl-3-pyridinecarboxamide in 100 ml of methanol and 10 ml of formic acid was added 0.60 g of 5% Pd/C as a catalyst and the mixture was stirred for 4 hours at room temperature under nitrogen atmosphere. After removing the catalyst by filtration the filtrate was concentrated to obtain a residue, which was recrystallized from a mixture of ethyl acetate and acetone, affording 1.87 g (yield: 83%) of the title compound having mp. 239°-241° C.

The following Table 1 and Table 2 show physical properties of the compounds associated with this invention. Numbers in the column "Evaluation" in Table 2 were obtained as follows.

A carrier was prepared by mixing 50 parts (by weight) of talc, 25 parts of bentonite, 2 parts of Solpole -9047 (Toho Chemical Co., Ltd, Japan) and 3 parts of Solpole -5039 (Toho Chemical Co., Ltd, Japan). 50 parts of a test compound and 200 parts of the carrier were mixed to obtain 20% wettable powder, followed by dispersing the powder in distilled water to make a dispersion of the definite concentrations.

Seeds of Oryza sativa L., Echinochloa crus-galli L., and Raphanus sativus L. were germinated in a laboratory dish, to which the dispersion was added. After breeding for 7 days in a thermostatic box kept at 25° C. under illumination of fluorescent tubes, growth of plant was observed. In the column of "Evaluation" of Table 2, the designation 1 denotes no influence, 2 denotes 25% growth inhibition, 3 denotes 50% growth inhibition, 4 denotes 75% growth inhibition and 5 denotes 100% growth inhibition.

                                      TABLE 1                                      __________________________________________________________________________     Example                            Melting Point                               No.   R            R.sub.2                                                                              R.sub.3                                                                             Method                                                                              (°C.)                                                                          Molecular Formula                    __________________________________________________________________________      1    4-chlorophenylmethyl                                                                        Cl    H    A    172.5-175                                                                             C.sub.21 H.sub.18 Cl.sub.2                                                     N.sub.2 O.sub.2                       2    2-dimethylaminoethyl                                                                        C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   B    121-122                                                                               C.sub.22 H.sub.31 N.sub.3                                                      O.sub.2                               3    phenylmethyl CH.sub.3                                                                             H    C    170.5-174                                                                             C.sub.22 H.sub.22 N.sub.2                                                      O.sub.2                               4    H            CH.sub.3                                                                             6-CH.sub.3                                                                          D    239-241                                                                               C.sub.16 H.sub.18 N.sub.2                                                      O.sub.2                               5    H            CH.sub.3                                                                             H    D    237-238                                                                               C.sub.15 H.sub.16 N.sub.2                                                      O.sub.2                               6    butyl        "     H    A    143-145                                                                               C.sub.19 H.sub.24 N.sub.2                                                      O.sub.2                               7    3-chlorophenylmethyl                                                                        "     H    A    193-195                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                               8    4-chlorophenylmethyl                                                                        "     H    A    170-172                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                               9    2-fluorophenylmethyl                                                                        "     H    A    205-207                                                                               C.sub.22 H.sub.21 FN.sub.2                                                     O.sub. 2                              10   4-fluorophenylmethyl                                                                        "     H    A    188-189                                                                               C.sub.22 H.sub.21 FN.sub.2                                                     O.sub.2                               11   3,4-dichlorophenylmethyl                                                                    CH.sub.3                                                                             H    A    219-221                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                       12   3-methoxyphenylmethyl                                                                       "     "    A      204-205.5                                                                           C.sub.23 H.sub.24 N.sub.2                                                      O.sub.3                               13   3-methylphenylmethyl                                                                        "     "    A    162-164                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               14   4-methylphenylmethyl                                                                        "     "    A    130-133                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               15   4-isopropylphenylmethyl                                                                     "     "    A    161-163                                                                               C.sub.25 H.sub.28 N.sub.2                                                      O.sub.2                               16   4-t-butylphenylmethyl                                                                       "     "    A    190.5-194                                                                             C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                               17   2-furylmethyl                                                                               "     "    A    147-149                                                                               C.sub.20 H.sub.20 N.sub.2                                                      O.sub.3                               18   4-pyridylmethyl                                                                             "     "    A    145-147                                                                               C.sub.21 H.sub.21 N.sub.3                                                      O.sub.2                               19   2-phenylethyl                                                                               "     "    A      158-159.5                                                                           C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               20   butyl        C.sub.2 H.sub.5                                                                      "    A    161.5-163.5                                                                           C.sub. 20 H.sub.26 N.sub.2                                                     O.sub.2                               21   phenylmethyl C.sub.2 H.sub.5                                                                      H    A    166-169                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               22   4-chlorophenylmethyl                                                                        "     "    A    190-191                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               23   4-methylphenylmethyl                                                                        "     "    A    179.5-183                                                                             C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               24   H            CH.sub.3                                                                             3-CH.sub.3                                                                          D    217-218                                                                               C.sub.16 H.sub.18 N.sub.2                                                      O.sub.2                               25   butyl        "     "    A    137-139                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                               26   phenylmethyl "     "    A    201-205                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               27   2-chlorophenylmethyl                                                                        "     "    A    --     C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               28   3-chlorophenylmethyl                                                                        "     "    A    233.5-236.5                                                                           C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               29   4-chlorophenylmethyl                                                                        "     "    A    --     C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               30   3,4-dichlorophenylmethyl                                                                    "     "    A    253-255                                                                               C.sub.23 H.sub.22 Cl.sub.2                                                     N.sub.2 O.sub.2                       31   2-fluorophenylmethyl                                                                        CH.sub.3                                                                             3-CH.sub.3                                                                          A    227.5- 229                                                                            C.sub.23 H.sub.23 FN.sub.2                                                     O.sub.2                               32   2-methoxyphenylmethyl                                                                       "     "    A    --     C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               33   3-methoxyphenylmethyl                                                                       "     "    A    199-204                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               34   4-methoxyphenylmethyl                                                                       "     "    A      158-160.5                                                                           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               35   3-methylphenylmethyl                                                                        "     "    A    203.5-209.5                                                                           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               36   4-methylphenylmethyl                                                                        "     "    A      175-176.5                                                                           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               37   4-isopropylphenylmethyl                                                                     "     "    A    197-199                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                               38   4-t-butylphenylmethyl                                                                       "     "    A    204-206                                                                               C.sub.27 H.sub.32 N.sub.2                                                      O.sub.2                               39   2-pyridylmethyl                                                                             "     "    A    189.5-191.5                                                                           C.sub.22 H.sub.23 N.sub.3                                                      O.sub.2                               40   butyl        "     4-CH.sub.3                                                                          A    160-162                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                               41   phenylmethyl CH.sub.3                                                                             4-CH.sub.3                                                                          A    202.5-208.5                                                                           C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               42   4-chlorophenylmethyl                                                                        "     "    A    202-206                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               43   4-methylphenylmethyl                                                                        "     "    A    172-177                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               44   phenylmethyl "     5-CH.sub.3                                                                          A      171-175.5                                                                           C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               45   butyl        "     6-CH.sub.3                                                                          A    195-202                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                               46   hexyl        "     "    A      119-120.5                                                                           C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2                               47   allyl        "     "    A    144-146                                                                               C.sub.19 H.sub.22 N.sub.2                                                      O.sub.2                               48   phenylmethyl "     "    A    184-188                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.2                               49   2-chlorophenylmethyl                                                                        "     "    A    194-198                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               50   3-chlorophenylmethyl                                                                        "     "    A    190-193                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               51   4-chlorophenylmethyl                                                                        CH.sub.3                                                                             6-CH.sub.3                                                                          A    176-179                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                               52   2,4-dichlorophenylmethyl                                                                    "     "    A    191.5-193                                                                             C.sub.23 H.sub.22 Cl.sub.2                                                     N.sub.2 O.sub. 2                      53   3,4-dichlorophenylmethyl                                                                    "     "    A      190-192.5                                                                           C.sub.23 H.sub.22 Cl.sub.2                                                     N.sub.2 O.sub.2                       54   4-isopropylphenylmethyl                                                                     "     "    A    192-194                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                               55   2-phenylethyl                                                                               "     "    A    190-192                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               56   4-fluorophenylmethyl                                                                        "     "    A    107-109                                                                               C.sub.23 H.sub.23 FN.sub.2                                                     O.sub.2                               57   2-methoxyphenylmethyl                                                                       "     "    A    --     C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               58   3-methoxyphenylmethyl                                                                       "     "    A    192.5-195                                                                             C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               59   4-methoxyphenylmethyl                                                                       "     "    A    183-185                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.3                               60   3-methylphenylmethyl                                                                        "     "    A    174-176                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               61   4-methylphenylmethyl                                                                        CH.sub.3                                                                             6-CH.sub.3                                                                          A      229-232.5                                                                           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               62   4-t-butylphenylmethyl                                                                       "     "    A    205-207                                                                               C.sub.27 H.sub.32 N.sub.2                                                      O.sub.2                               63   2-furylmethyl                                                                               "     "    A    130.5-133                                                                             C.sub. 21 H.sub.22 N.sub.2                                                     O.sub.3                               64   2-pyridylmethyl                                                                             "     "    A    151-154                                                                               C.sub.22 H.sub.23 N.sub.3                                                      O.sub.2                               65   2-phenylethyl                                                                               C.sub.2 H.sub.5                                                                      "    A    144-146                                                                               C.sub.25 H.sub.28 N.sub.2                                                      O.sub.2                               66   butyl        "     "    A    133-135                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                               67   allyl        "     "    A    141-143                                                                               C.sub.20 H.sub.24 N.sub.2                                                      O.sub.2                               68   phenylmethyl "     "    A    150.5-153                                                                             C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                               69   3-chlorophenylmethyl                                                                        "     "    A    113-115                                                                               C.sub.24 H.sub.25 ClN.sub.2                                                    O.sub.2                               70   4-chlorophenylmethyl                                                                        "     "    A    169-171                                                                               C.sub.24 H.sub.25 ClN.sub.2                                                    O.sub.2                               71   3-methoxyphenylmethyl                                                                       C.sub.2 H.sub.5                                                                      6-CH.sub.3                                                                          A    112-115                                                                               C.sub.25 H.sub.28 N.sub.2                                                      O.sub.3                               72   3-methylphenylmethyl                                                                        "     "    A    125-128                                                                               C.sub.25 H.sub.28 N.sub.2                                                      O.sub.2                               73   4-methylphenylmethyl                                                                        "     "    A    146.5-151                                                                             C.sub.25 H.sub.28 N.sub.2                                                      O.sub.2                               74   H            "     6-C.sub.2 H.sub.5                                                                   D    187-189                                                                               C.sub.18 H.sub.22 N.sub.2                                                      O.sub.2                               75   methyl       "     "    B    130-132                                                                               C.sub.19 H.sub.24 N.sub.2                                                      O.sub.2                               76   ethyl        "     "    B    115-116                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                               77   propyl       "     "    A    116-118                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                               78   butyl        "     "    A      120-121.5                                                                           C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2                               79   2-methylpropyl                                                                              "     "    A    136.5-138                                                                             C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2                               80   pentyl       "     "    A    96-98  C.sub.23 H.sub.32 N.sub.2                                                      O.sub.2                               81   3-methylbutyl                                                                               C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A    128-130                                                                               C.sub.23 H.sub.32 N.sub.2                                                      O.sub.2                               82   hexyl        "     "    A    109-110                                                                               C.sub.24 H.sub.34 N.sub.2                                                      O.sub.2                               83   octyl        "     "    A    oil -  C.sub.26 H.sub.38 N.sub.2                                                      O.sub.2                               84   2-ethylhexyl "     "    A    oil -  C.sub.26 H.sub.38 N.sub. 2                                                     O.sub.2                               85   dodecyl      "     "    A    75-80  C.sub.30 H.sub.16 N.sub.2                                                      O.sub.2                               86   cyclohexylmethyl                                                                            "     "    A      154-154.5                                                                           C.sub.25 H.sub.34 N.sub.2                                                      O.sub.2                               87   allyl        "     "    A    154-156                                                                               C.sub.21 H.sub.26 N.sub.2                                                      O.sub.2                               88   2-propynyl   "     "    A    159-161                                                                               C.sub.21 H.sub.21 N.sub.2                                                      O.sub.2                               89   phenylmethyl "     "    A      142-146.5                                                                           C.sub.25 H.sub.28 N.sub.2                                                      O.sub.2                               90   2-chlorophenylmethyl                                                                        "     "    A    --     C.sub.25 H.sub.27 ClN.sub.2                                                    O.sub.2                               91   4-chlorophenylmethyl                                                                        C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A      174-176.5                                                                           C.sub.25 H.sub.27 ClN.sub.2                                                    O.sub.2                               92   2,4-dichlorophenylmethyl                                                                    "     "    A    --     C.sub.25 H.sub.26 Cl.sub.2                                                     N.sub.2 O.sub.2                       93   3,4-dichlorophenylmethyl                                                                    "     "    A    --     C.sub.25 H.sub.26 Cl.sub.2                                                     N.sub.2 O.sub.2                       94   2-fluorophenylmethyl                                                                        "     "    A    146.5-150.5                                                                           C.sub.25 H.sub.27 FN.sub.2                                                     O.sub.2                               95   4-fluorophenylmethyl                                                                        "     "    A    153-155                                                                               C.sub.25 H.sub.27 FN.sub.2                                                     O.sub.2                               96   3-methoxyphenylmethyl                                                                       "     "    A    120-122                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.3                               97   4-methoxyphenylmethyl                                                                       "     "    A    160-162                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.3                               98   3-methylphenylmethyl                                                                        "     "    A    128-129                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                               99   4-methylphenylmethyl                                                                        "     "    A    165-167                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                              100   2-furylmethyl                                                                               "     "    A    146-148                                                                               C.sub.23 H.sub.26 N.sub.2                                                      O.sub.3                              101   2-pyridylmethyl                                                                             C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A      179-184.5                                                                           C.sub.24 H.sub.27 N.sub.3                                                      O.sub.2                              102   2-tetrahydrofurylmethyl                                                                     "     "    A    115-117                                                                               C.sub.23 H.sub.30 N.sub.2                                                      O.sub.3                              103   2-phenylethyl                                                                               "     "    A    113-115                                                                               C.sub.26 H.sub.30 N.sub.2                                                      O.sub.2                              104   2-hydroxyethyl                                                                              "     "    B    203-205                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.3                              105   2-methoxyethyl                                                                              "     "    A    --     C.sub.21 H.sub.28 N.sub.2                                                      O.sub.3                              106   2-ethoxyethyl                                                                               "     "    A    115-117                                                                               C.sub.22 H.sub.30 N.sub.2                                                      O.sub.3                              107   2-ethylthioethyl                                                                            "     "    B      137-138.5                                                                           C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2 S                            108   3-methoxypropyl                                                                             "     "    A    106-107                                                                               C.sub.22 H.sub.30 N.sub.2                                                      O.sub.3                              109   3-ethoxypropyl                                                                              "     "    A      88-89.5                                                                             C.sub.23 H.sub.32 N.sub.2                                                      O.sub.3                              110   3-isopropoxypropyl                                                                          "     "    A    110-111                                                                               C.sub.24 H.sub.34 N.sub.2                                                      O.sub.3                              111   3-(2-ethylhexyloxy)propyl                                                                   C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   B    --     C.sub.29 H.sub.44 N.sub.2                                                      O.sub.3                              112   3-dimethylaminopropyl                                                                       "     "    B      111-113.8                                                                           C.sub.23 H.sub.33 N.sub.3                                                      O.sub.2                              113   H            i-C.sub.3 H.sub.7                                                                    6-i-C.sub.3 H.sub.7                                                                 D    119-121                                                                               C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                              114   allyl        "     "    A    165-167                                                                               C.sub.23 H.sub.30 N.sub.2                                                      O.sub.2                              115   phenylmethyl "     "    A    216-219                                                                               C.sub.27 H.sub.32 N.sub.2                                                      O.sub.2                              116   4-chlorophenylmethyl                                                                        "     "    A    206.5-207.5                                                                           C.sub.27 H.sub.31 ClN.sub.2                                                    O.sub.2                              117   4-methoxyphenylmethyl                                                                       "     "    A    204.5-209.5                                                                           C.sub.28 H.sub.34 N.sub.2                                                      O.sub.3                              118   4-methylphenylmethyl                                                                        "     "    A    198-207                                                                               C.sub.28 H.sub.34 N.sub.2                                                      O.sub.2                              119   butyl        Cl    6-CH.sub.3                                                                          A    147.5-150                                                                             C.sub.19 H.sub.23 ClN.sub.2                                                    O.sub.2                              120   butyl        CH.sub.3                                                                             5-Cl A    149-162                                                                               C.sub.19 H.sub.23 ClN.sub.2                                                    O.sub.2                              121   phenylmethyl CH.sub.3                                                                             5-Cl A    148-156                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                              122   4-chlorophenylmethyl                                                                        "     "    A    222-224                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      123   H            Cl    H    B      264-264.5                                                                           C.sub.14 H.sub.13 ClN.sub.2                                                    O.sub.2                              124   butyl        "     "    A    185-187                                                                               C.sub.18 H.sub.21 ClN.sub. 2                                                   O.sub.2                              125   3-chlorophenylmethyl                                                                        "     "    A    192-194                                                                               C.sub.21 H.sub.18 Cl.sub.2                                                     N.sub.2 O.sub.2                      126   3,4-dichlorophenylmethyl                                                                    "     "    A    226-228                                                                               C.sub.21 H.sub.17 Cl.sub.3                                                     N.sub.2 O.sub.2                      127   2-fluorophenylmethyl                                                                        "     "    A    203-205                                                                               C.sub.21 H.sub.18 ClFN.sub.2                                                   O.sub.2                              128   4-fluorophenylmethyl                                                                        "     "    A    186-188                                                                               C.sub.21 H.sub. 18 ClFN.sub.2                                                  O.sub.2                              129   3-methoxyphenylmethyl                                                                       "     "    A    190-193                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.3                              130   4-methoxyphenylmethyl                                                                       "     "    A    221-223                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.3                              131   3-methylphenylmethyl                                                                        Cl    H    A    180-182                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                              132   4-methylphenylmethyl                                                                        "     "    A      165-167.5                                                                           C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                              133   4-isopropylphenylmethyl                                                                     "     "    A    184-186                                                                               C.sub.24 H.sub.25 ClN.sub.2                                                    O.sub.2                              134   4-t-butylphenylmethyl                                                                       "     "    A    220.5-223                                                                             C.sub.25 H.sub.27 ClN.sub.2                                                    O.sub.2                              135   2-furylmethyl                                                                               "     "    A    169-171                                                                               C.sub.19 H.sub.17 ClN.sub.2                                                    O.sub.3                              136   2-pyridylmethyl                                                                             "     "    A    181-183                                                                               C.sub.20 H.sub.18 ClN.sub.3                                                    O.sub.2                              137   3-pyridylmethyl                                                                             "     "    A      195-196.5                                                                           C.sub.20 H.sub.18 ClN.sub.3                                                    O.sub.2                              138   4-pyridylmethyl                                                                             "     "    A    195-197                                                                               C.sub.20 H.sub.18 ClN.sub.3                                                    O.sub.2                              139   butyl        "     3-Cl A    197.5-200.5                                                                           C.sub.18 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      140   4-chlorophenylmethyl                                                                        "     "    A    227-229                                                                               C.sub.21 H.sub.17 Cl.sub.3                                                     N.sub.2 O.sub.2                      141   4-methylphenylmethyl                                                                        Cl    3-Cl A    201-203                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      142   butyl        "     4-Cl A    213-215                                                                               C.sub.18 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      143   phenylmethyl "     "    A    249-251                                                                               C.sub.21 H.sub.18 Cl.sub.2                                                     N.sub.2 O.sub.2                      144   4-chlorophenylmethyl                                                                        "     "    A    260-262                                                                               C.sub.21 H.sub.17 Cl.sub.3                                                     N.sub.2 O.sub.2                      145   4-methylphenylmethyl                                                                        "     "    A    237-239                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      146   2-phenylethyl                                                                               "     "    A    203-212                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      147   butyl        "     5-Cl A    162-164                                                                               C.sub.18 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      148   phenylmethyl "     "    A    118-120                                                                               C.sub.21 H.sub.18 Cl.sub.2                                                     N.sub.2 O.sub.2                      149   4-chlorophenylmethyl                                                                        "     "    A    194-197                                                                               C.sub.21 H.sub.17 Cl.sub.3                                                     N.sub.2 O.sub.2                      150   4-methylphenylmethyl                                                                        "     "    A      173-174.5                                                                           C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      151   butyl        Cl    6-Cl A    169-171                                                                               C.sub.18 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      152   phenylmethyl "     "    A      168-172.5                                                                           C.sub.21 H.sub.18 Cl.sub.2                                                     N.sub.2 O.sub.2                      153   4-chlorophenylmethyl                                                                        "     "    A    115.5-120                                                                             C.sub.21 H.sub.17 Cl.sub.3                                                     N.sub.2 O.sub.2                      154   4-methylphenylmethyl                                                                        "     "    A    --     C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      155   butyl        OCH.sub.3                                                                            H    A    158-160                                                                               C.sub.19 H.sub.24 N.sub.2                                                      O.sub.3                              156   phenylmethyl "     "    A    240-242                                                                               C.sub.22 H.sub.22 N.sub.2                                                      O.sub.3                              157   4-chlorophenylmethyl                                                                        "     "    A    227.5-230.5                                                                           C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.3                              158   4-methylphenylmethyl                                                                        "     "    A    206.5-209                                                                             C.sub.23 H.sub.24 N.sub.2                                                      O.sub.3                              159   phenylmethyl OPh   "    A      213-214.5                                                                           C.sub.27 H.sub.24 N.sub.2                                                      O.sub.3                              160   4-chlorophenylmethyl                                                                        "     "    A      232-233.5                                                                           C.sub.27 H.sub.23 ClN.sub.2                                                    O.sub.3                              161   4-methylphenyl                                                                              OPh   H    A    191.5-193                                                                             C.sub.28 H.sub. 26 N.sub.2                                                     O.sub.3                               162* phenylmethyl COOH  "    *    290-294                                                                               C.sub.22 H.sub.20 N.sub.2                                                      O.sub.4                               163**                                                                               H            COOK  "    **   198-200                                                                               C.sub.14 H.sub.13 N.sub.2                                                      O.sub.4 K                              164***                                                                             phenylmethyl "     "    ***  210-215                                                                               C.sub.22 H.sub.19 N.sub.2                                                      O.sub.4 K                            165   H            COOCH.sub.3                                                                          "    D    217-218                                                                               C.sub.15 H.sub.16 N.sub.2                                                      O.sub.4                              166   phenylmethyl "     "    A    186.5-188                                                                             C.sub.23 H.sub.22 N.sub.2                                                      O.sub.4                              167   4-chlorophenylmethyl                                                                        "     "    A    190-192                                                                               C.sub.23 H.sub.21 ClN.sub.2                                                    O.sub.4                              168   4-methylphenylmethyl                                                                        "     "    A      152-153.5                                                                           C.sub.24 H.sub.21 N.sub.2                                                      O.sub.4                               *Compound 162 was obtained by treating Compound 164 with a dilute HCl.         **Compound 163 was obtained by hydrolyzing Compound 165 with equimolecula      KOH.                                                                           ***Compound 164 was obtained by hydrolyzing Compound 166 with                  equimolecular KOH.                                                       

    169   pentyl       CH.sub.3                                                                             H    A      124-125.5                                                                           C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                              170   hexyl        "     "    A    130-132                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                              171   2-ethoxyethyl                                                                               "     "    A      99-100.5                                                                            C.sub.19 H.sub.24 N.sub.2                                                      O.sub.3                               172* phenylmethyl "     "    A           C.sub.22 H.sub.23 ClN.sub.2                                                    O.sub.2                              173   2-pyridylmethyl                                                                             "     "    A    146-148                                                                               C.sub.21 H.sub.21 N.sub.3                                                      O.sub.2                              174   3-pyridylmethyl                                                                             "     "    A    161-163                                                                               C.sub.21 H.sub.21 N.sub.3                                                      O.sub.2                              175   pentyl       C.sub.2 H.sub.5                                                                      "    A    144-145                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                              176   2-phenylethyl                                                                               "     "    A    145-147                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                              177   pentyl       CH.sub.3                                                                             3-CH.sub.3                                                                          A    165-167                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                              178   hexyl        "     "    A    138.5-140.5                                                                           C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2                               *Compound 172 is a hydrochloride                                         

    179   2-ethoxyethyl                                                                               CH.sub.3                                                                             3-CH.sub.3                                                                          A    111.5-113                                                                             C.sub.20 H.sub.26 N.sub.2                                                      O.sub.3                              180   2-phenylethyl                                                                               "     "    A      189-191.5                                                                           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                              181   4-pyridylmethyl                                                                             "     "    A    230-232                                                                               C.sub.22 H.sub.23 N.sub.3                                                      O.sub.2                              182   2-phenylethyl                                                                               "     4-CH.sub.3                                                                          A           C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                              183   butyl        "     5-CH.sub.3                                                                          A      169-170.5                                                                           C.sub.20 H.sub.26 N.sub.2                                                      O.sub.2                              184   2-phenylethyl                                                                               "     "    A    155-157                                                                               C.sub.24 H.sub.26 N.sub.2                                                      O.sub.2                              185   pentyl       "     6-CH.sub.3                                                                          A    191-194                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.2                              186   2-ethoxyethyl                                                                               "     "    A    105.8-107.5                                                                           C.sub.20 H.sub.26 N.sub.2                                                      O.sub.3                              187   pentyl       C.sub.2 H.sub.5                                                                      "    A    94.8-96                                                                               C.sub.22 H.sub.30 N.sub.2                                                      O.sub.2                              188   hexyl        "     "    A    oil    C.sub.23 H.sub.32 N.sub.2                                                      O.sub.2                              189   2-ethoxyethyl                                                                               C.sub.2 H.sub.5                                                                      6-CH.sub.3                                                                          A    113-115                                                                               C.sub.21 H.sub.28 N.sub.2                                                      O.sub.3                               190* butyl        "     6-C.sub.2 H.sub.5                                                                               C.sub.24 H.sub.31 F.sub.3                                                      N.sub.2 O.sub.4                       191**                                                                               butyl        "     "                C.sub.22 H.sub.31 ClN.sub.2                                                    O.sub.2                              192   2-(4-chlorophenylethyl)                                                                     "     "    A    164-166                                                                               C.sub.26 H.sub.29 ClN.sub.2                                                    O.sub.2                              193   2-(2-chlorophenylethyl)                                                                     "     "    A    125-127                                                                               C.sub.26 H.sub.29 ClN.sub.2                                                    O.sub.2                              194   3-phenylpropyl                                                                              "     "    A    147-149                                                                               C.sub.27 H.sub.32 N.sub.2                                                      O.sub.2                              195   4-phenylbutyl                                                                               "     "    A    oil    C.sub.28 H.sub.34 N.sub.2                                                      O.sub.2                              196   2-thienylmethyl                                                                             "     "    A      90-94.5                                                                             C.sub.23 H.sub.26 N.sub.2                                                      O.sub.2 S                            197   2-(2-pyridylethyl)                                                                          "     "    A    oil    C.sub.25 H.sub.29 N.sub.3                                                      O.sub.2                              198   benzyl       CH.sub.3                                                                             3-Cl A    187-189                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                               *Compound 190 is a trifluoroacetate                                            **Compound 191 is a hydrochloride                                        

    199   4-methylphenylmethyl                                                                        CH.sub.3                                                                             3-Cl A      178-181.5                                                                           C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                              200   butyl        "     3-Cl A    170-172                                                                               C.sub.19 H.sub.23 ClN.sub.2                                                    O.sub.2                              201   2-phenylethyl                                                                               "     "    A    186-188                                                                               C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                              202   2-phenylethyl                                                                               "     5-Cl A    177.5-179.5                                                                           C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                              203   2-phenylethyl                                                                               Cl    6-CH.sub.3                                                                          A    173.5-175                                                                             C.sub.23 H.sub.23 ClN.sub.2                                                    O.sub.2                              204   pentyl       "     H    A      188-189.5                                                                           C.sub.19 H.sub.23 ClN.sub.2                                                    O.sub.2                              205   hexyl        "     "    A    165-167                                                                               C.sub.20 H.sub.25 ClN.sub.2                                                    O.sub.2                              206   2-phenylethyl                                                                               "     "    A    168-170                                                                               C.sub.22 H.sub.21 ClN.sub.2                                                    O.sub.2                              207   2-thienylmethyl                                                                             "     "    A    189.5-190.5                                                                           C.sub.19 H.sub.17 ClN.sub.2                                                    O.sub.2 S                            208   2-phenylethyl                                                                               "     3-Cl A    200-203                                                                               C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      209   2-phenylethyl                                                                               Cl    6-Cl A      182-184.5                                                                           C.sub.22 H.sub.20 Cl.sub.2                                                     N.sub.2 O.sub.2                      210   2-phenylethyl                                                                               OCH.sub.3                                                                            H    A    191-195                                                                               C.sub.23 H.sub.24 N.sub.2                                                      O.sub.3                              211   butyl        COOCH.sub.3                                                                          "    A    132.8-134                                                                             C.sub.20 H.sub.24 N.sub.2                                                      O.sub.4                              212   2-phenylethyl                                                                               COOCH.sub.3                                                                          "    A    159-161                                                                               C.sub.24 H.sub.24 N.sub.2                                                      O.sub.4                              213   2-aminoethyl C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   B    oil    C.sub.20 H.sub.27 N.sub.3                                                      O.sub.2                              214   phenylmethyloxy                                                                             Cl    H    A    174-175                                                                               C.sub.21 H.sub.19 ClN.sub.2                                                    O.sub.3                              215   phenylmethyloxy                                                                             C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A    foam   C.sub.25 H.sub.28 N.sub.2                                                      O.sub.3                              216   methoxy      C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A    126-127                                                                               C.sub.19 H.sub.24 N.sub.2                                                      O.sub.3                              217   pentyloxy    C.sub.2 H.sub.5                                                                      6-C.sub.2 H.sub.5                                                                   A    oil    C.sub.23 H.sub.32 N.sub.2                                                      O.sub.3                              __________________________________________________________________________

                                      TABLE 2                                      __________________________________________________________________________                                                          Evaluation                Ex. IR              NMR                              Conc.                                                                              Plant.                No. ν value (cm.sup.-1)                                                                   Method                                                                               Chemical shift δ value                                                                             Solvent                                                                               (ppm)                                                                              X Y Z                 __________________________________________________________________________     1   1627, 1663                                                                               KBr                                    20  1 4 1                                                                      100 3 4 1                 2   1630      "     2.28(6H), 2.42(3H), 2.90(3H), 6.40(1H,                                                                   CDCl.sub.3                                                                            20  1 1 1                                                                      100 1 1 2                 3   1625, 1655                                                                               "     2.24(3H), 2.43(3H), 2.81(3H), 6.42(1H,                                                                   CDCl.sub.3                                                                            20  4 4 1                                                                      100 4 4 2                 4   1600, 1650                                                                               "     2.17(6H), 2.25(3H), 2.65(3H), 6.20(1H,                                                                   DMSO-d.sub.6                                                                          20  1 1 1                                                                      100 1 1 3                 5   1600, 1637, 1653                                                                         "     2.22(3H), 2.27(3H), 2.71(3H), 6.20(1H,                                                                   "-H)   20  1 1 3                                                                      100 1 1 5                 6   1623, 1675                                                                               "     2.32(3H), 2.38(3H), 2.88(3H), 6.35(1H,                                                                   CDCl.sub.3                                                                            20  2 3 3                                                                      100 3 4 4                 7   1623, 1655                                                                               "     2.24(3H), 2.42(3H), 2.80(3H), 6.43(1H,                                                                   "-H)   20  3 4 1                                                                      100 3 4 1                 8   1623, 1657                                                                               "     2.20(3H), 2.39(3H), 2.77(3H), 6.41(1H,                                                                   "-H)   20  4 4 1                                                                      100 4 4 1                 9   1623, 1660                                                                               "     2.27(3H), 2.43(3H), 2.85(3H), 6.48(1H,                                                                   "-H)   20  2 4 1                                                                      100 3 4 1                 10  1630, 1665                                                                               "     2.24(3H), 2.41(3H), 2.81(3H), 6.45(1H,                                                                   "-H)   20  4 3 1                                                                      100 4 4 3                 11  1627, 1663                                                                               "     2.23(3H), 2.42(3H), 2.80(3H), 6.44(1H,                                                                   "-H)   20  1 4 1                                                                      100 1 4 1                 12  1607, 1630, 1665                                                                         "     2.25(3H), 2.41(3H), 2.80(3H), 3.72(3H), 6.40(1H,                                                         "-H)   20  4 4 1                                                                      100 4 4 1                 13  1627, 1653                                                                               "     2.25(3H), 2.30(3H), 2.42(3H), 2.84(3H), 6.46(1H,                                                         "-H)   20  3 4 1                                                                      100 3 4 1                 14  1607, 1657                                                                               "     2.22(3H), 2.29(3H), 2.40(3H), 2.80(3H), 6.41(1H,                                                         "-H)   20  4 3 2                                                                      100 4 3 2                 15  1625, 1663                                                                               "     2.28(3H), 2.42(3H), 2.84(3H), 6.45(1H,                                                                   "-H)   20  4 3 1                                                                      100 4 3 1                 16  1627, 1663                                                                               "     1.27(9H), 2.29(3H), 2.42(3H), 2.83(3H), 6.43(1H,                                                         "-H)   20  1 1 1                                                                      100 2 2 1                 17  1627, 1660                                                                               "                                      20  1 3 1                                                                      100 1 3 4                 18  1625, 1657                                                                               "                                      20  3 4 1                                                                      100 3 4 1                 19  1623, 1655                                                                               "     2.30(3H), 2.40(3H), 2.97(3H), 6.36(1H,                                                                   "-H)   20  1 1 1                                                                      100 1 3 4                 20  1617, 1665                                                                               "     2.34(3H), 2.90(3H), 6.37(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 1 3 4                 21                  2.25(3H), 2.81(3H), 6.44(1H, 5-H)                                                                        "      20  1 3 1                                                                      100 3 4 5                 22  1627, 1657                                                                               "     2.23(3H), 2.80(3H), 6.44(1H, 5-H)                                                                        "      20  2 4 1                                                                      100 3 4 1                 23                  2.25(3H), 2.30(3H), 2.82(3H), 6.46(1H,                                                                   " H)   20  2 4 1                                                                      100 3 4 1                 24  1605, 1645                                                                               "     2.12(3H), 2.24(3H), 2.26(3H), 2.73(3H), 6.25(1H,                                                         "-H)   20  1 1 5                                                                      100 1 3 5                 25  1607, 1630, 1663                                                                         "     2.27(6H), 2.36(3H), 2.90(3H), 6.35(1H,                                                                   "-H)   20  1 3 4                                                                      100 3 4 4                 26                  2.26(3H), 2.30(6H), 2.81(3H), 6.45(1H,                                                                   "-H)   20  4 4 1                                                                      100 4 4 3                 27                  2.22(3H), 2.30(6H), 2.80(3H), 6.45(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 3 1                 28  1610, 1625, 1665                                                                         "                                      20  3 4 1                                                                      100 4 4 1                 29  1617, 1647                                                                               "     2.23(3H), 2.28(6H), 2.78(3H), 6.42(1H,                                                                   "-H)   20  4 4 1                                                                      100 4 4 1                 30  1620, 1650                                                                               "     2.27(3H), 2.30(6H), 2.80(3H), 6.45(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 3 1                 31  1615, 1665                                                                               "     2.27(3H), 2.28(6H), 2.82(3H), 6.47(1H,                                                                   "-H)   20  1 4 1                                                                      100 1 4 1                 32                  2.24(3H), 2.30(6H), 2.80(3H), 6.47(1H,                                                                   "-H)   20  1 1 1                                                                      100 1 2 1                 33  1607, 1627, 1657                                                                         "     2.28(3H), 2.30(6H), 2.82(3H), 3.70(3H), 6.45(1H,                                                         "-H)   20  3 3 1                                                                      100 4 4 1                 34  1625, 1655                                                                               "     2.27(3H), 2.29(6H), 2.82(3H), 3.74(3H), 6.43(1H,                                                         "-H)   20  4 4 1                                                                      100 4 4 1                 35  1605, 1623, 1665                                                                         "     2.28(12H), 2.81(3H), 6.43(1H, 5-H)                                                                       "      20  4 4 1                                                                      100 4 4 1                 36  1623, 1653                                                                               "     2.25(3H), 2.28(9H), 2.81(3H), 6.42(1H,                                                                   "-H)   20  4 4 1                                                                      100 4 4 1                 37  1607, 1623, 1657                                                                         "     2.29(9H), 2.82(3H), 6.43(1H, 5-H)                                                                        "      20  1 4 1                                                                      100 1 4 2                 38  1623, 1667                                                                               "     1.27(9H), 2.29(9H), 2.83(3H), 6.45(1H,                                                                   "-H)                             39                  2.28(9H), 2.82(3H), 6.44(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  4 4 1                                                               DMSO-d.sub.6                                                                          100 4 4 1                 40  1627, 1657                                                                               "     2.24(3H), 2.31(6H), 2.88(3H), 6.31(1H,                                                                   CDCl.sub.3                                                                            20  1 1 4                                                                      100 1 2 4                 41  1617, 1650                                                                               "     2.27(6H), 2.39(3H), 2.83(3H), 6.44(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 4 1                 42  1615, 1655                                                                               "                                      20  1 2 1                                                                      100 1 4 1                 43  1617, 1665                                                                               "                                      20  1 3 1                                                                      100 2 3 1                 44  1623, 1647                                                                               "     2.23(3H), 2.30(3H), 2.37(3H), 2.81(3H), 6.42(1H,                                                         "-H)   20  1 3 1                                                                      100 3 4 5                 45  1617, 1655                                                                               "     2.24(6H), 2.36(3H), 2.86(3H), 6.37(1H,                                                                   "-H)   20  1 2 4                                                                      100 2 4 3                 46  1627, 1653                                                                               "     2.27(6H), 2.37(3H), 2.87(3H), 6.38(1H,                                                                   "-H)   20  1 2 4                                                                      100 3 4 4                 47  1625, 1655                                                                               "     2.27(6H), 2.35(3H), 2.83(3H), 6.42(1H,                                                                   "-H)   20  1 1 3                                                                      100 1 2 4                 48  1635, 1660                                                                               "     2.29(9H), 2.80(3H), 6.47(1H, 5-H)                                                                        "      20  4 4 2                                                                      100 4 4 5                 49  1627, 1657                                                                               "     2.23(3H), 2.27(6H), 2.76(3H), 6.45(1H,                                                                   "-H)   20  1 4 1                                                                      100 4 4 1                 50  1627, 1655                                                                               "     2.25(3H), 2.27(6H), 2.75(3H), 6.42(1H,                                                                   "-H)   20  3 4 1                                                                      100 4 4 1                 51  1635, 1667                                                                               "     2.27(9H), 2.75(3H), 6.42(1H, 5-H)                                                                        "      20  3 4 2                                                                      100 3 4 4                 52  1630, 1663                                                                               "     2.23(3H), 2.27(6H), 2.74(3H), 6.45(1H,                                                                   "-H)   20  2 3 1                                                                      100 4 4 4                 53  1625, 1663                                                                               "     2.26(9H), 2.76(3H), 6.44(1H, 5-H)                                                                        "      20  2 4 1                                                                      100 4 4 1                 54  1635, 1655                                                                               "     2.30(9H), 2.79(3H), 6.42(1H, 5-H)                                                                        "      20  2 3 1                                                                      100 2 4 1                 55  1600, 1627, 1660                                                                         "     2.28(6H), 2.33(3H), 2.92(3H), 6.40(1H,                                                                          20H)                                                                               4 5 4                                                                      100 5 5 4                 56  1603, 1627                                                                               "     2.26(9H), 2.77(3H), 6.46(1H, 5-H)                                                                        "      20  1 2 2                                                                      100 2 3 4                 57                  2.24(3H), 2.27(6H), 2.76(3H), 3.82(3H), 6.45(1H,                                                         "-H)   20  1 4 1                                                                      100 4 4 1                 58  1603, 1625, 1650                                                                         "     2.29(9H), 2.80(3H), 3.74(3H), 6.45(1H,                                                                   "-H)   20  2 4 1                                                                      100 4 4 1                 59  1613, 1637, 1665                                                                         "     2.27(9H), 2.79(3H), 3.73(3H), 6.43(1H,                                                                   CDCl.sub.3                                                                            20  3 3 1                                                               DMSO-d.sub.6                                                                          100 4 3 1                 60  1623, 1653                                                                               "     2.27(12H), 2.80(3H), 6.46(1H, 5-H)                                                                       CDCl.sub.3                                                                            20  3 4 1                                                                      100 3 4 4                 61  1600, 1637, 1665                                                                         "     2.26(12H), 2.78(3H), 6.42(1H, 5-H)                                                                       "      20  4 4 1                                                                      100 4 4 3                 62  1635, 1660                                                                               "                                                                63  1627, 1660                                                                               "     2.27(6H), 2.45(3H), 2.91(3H), 6.41(1H,                                                                   "-H)   20  1 1 2                                                                      100 2 4 4                 64  1625      "     2.24(6H), 2.30(3H), 2.78(3H), 6.44(1H,                                                                   CDCl.sub.3                                                                            20  1 3 1                                                               DMSO-d.sub.6                                                                          100 4 3 1                 65  1627, 1655                                                                               "     2.28(3H), 2.34(3H), 2.93(3H), 6.36(1H,                                                                   CDCl.sub.3                                                                            20  4 5 4                                                                      100 4 5 4                 66  1617, 1657                                                                               "     2.26(3H), 2.37(3H), 2.87(3H), 6.38(1H,                                                                   "-H)   20  1 2 2                                                                      100 2 3 4                 67  1623, 1647                                                                               "     2.27(3H), 2.31(3H), 2.82(3H), 6.43(1H,                                                                   "-H)   20  1 1 2                                                                      100 2 3 3                 68  1625      "     2.26(6H), 2.79(3H), 6.47(1H, 5-H)                                                                        "      20  2 2 3                                                                      100 2 3 5                 69  1603, 1633                                                                               "     2.25(6H), 2.76(3H), 6.45(1H, 5-H)                                                                        "      20  1 1 3                                                                      100 1 3 4                 70  1627, 1660                                                                               "     2.24(6H), 2.76(3H), 6.45(1H, 5-H)                                                                        "      20  2 4 3                                                                      100 3 4 5                 71  1627      "     2.24(6H), 2.76(3H), 3.71(3H), 6.41(1H,                                                                   "-H)   20  1 3 1                                                                      100 3 4 3                 72  1630, 1650                                                                               "     2.28(6H), 2.34(3H), 2.79(3H), 6.47(1H,                                                                   "-H)   20  2 3 1                                                                      100 4 4 4                 73  1625, 1663                                                                               "     2.27(3H), 2.31(6H), 2.80(3H), 6.48(1H,                                                                   CDCl.sub.3                                                                            20  1 4 1                                                               DMSO-d.sub.6                                                                          100 3 4 4                 74                  1.96(3H), 2.60(3H), 6.28(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  1 2 1                                                                      100 1 2 4                 75  1625, 1655                                                                               "     2.29(3H), 2.79(3H), 3.42(3H), 6.36(1H,                                                                   "-H)   20  1 4 4                                                                      100 3 4 4                 76  1615      "     2.38(3H), 2.88(3H), 6.40(1H, 5-H)                                                                        "      20  1 2 3                                                                      100 1 3 4                 77  1615, 1663                                                                               "     2.34(3H), 3.34(3H), 6.39(1H, 5-H)                                                                        "      20  2 2 4                                                                      100 2 3 4                 78  1623, 1655                                                                               "     2.38(3H), 2.88(3H), 6.40(1H, 5-H)                                                                        "      20  1 4 3                                                                      100 4 4 3                 79  1627, 1665                                                                               "     2.37(3H), 2.84(3H), 6.40(1H, 5-H)                                                                        "      20  1 3 4                                                                      100 2 4 4                 80  1623      "     2.37(3H), 2.87(3H), 6.39(1H, 5-H)                                                                        "      20  4 4 4                                                                      100 5 4 4                 81  1623, 1653                                                                               "     2.38(3H), 2.88(3H), 6.39(1H, 5-H)                                                                        "      20  2 4 3                                                                      100 4 4 3                 82  1627, 1655                                                                               Neat  2.39(3H), 2.87(3H), 6.40(1H, 5-H)                                                                        "      20  4 4 4                                                                      100 5 4 4                 83  1630, 1663                                                                               "     2.39(3H), 2.88(3H), 6.41(1H, 5-H)                                                                        "      20  2 3 3                                                                      100 3 4 4                 84  1627, 1660                                                                               "     2.35(3H), 2.84(3H), 6.39(1H, 5-H)                                                                        "      20  1 5 3                                                                      100 4 5 4                 85  1630, 1663                                                                               KBr   2.38(3H), 2.88(3H), 6.40(1H, 5-H)                                                                        "                                86  1620      "     2.37(3H), 2.86(3H), 6.39(1H, 5-H)                                                                        "      20  3 3 4                                                                      100 4 4 4                 87  1623, 1645                                                                               "     2.31(3H), 2.80(3H), 6.41(1H, 5-H)                                                                        "      20  2 3 3                                                                      100 2 4 4                 88  1627, 1645                                                                               "     2.42(3H), 3.92(3H), 6.39(1H, 5-H)                                                                        "      20  1 2 3                                                                      100 1 2 4                 89  1615      "     2.28(3H), 2.78(3H), 6.48(1H, 5-H)                                                                        "      20  1 3 5                                                                      100 1 4 5                 90                  2.25(3H), 2.78(3H), 6.49(1H, 5-H)                                                                        "      20  1 2 4                                                                      100 4 3 4                 91                  2.28(3H), 2.79(3H), 6.49(1H, 5-H)                                                                        "      20  1 4 2                                                                      100 1 4 4                 92                  2.25(3H), 2.76(3H), 6.49(1H, 5-H)                                                                        "      20  2 3 3                                                                      100 3 4 4                 93                  2.27(3H), 2.76(3H), 6.47(1H, 5-H)                                                                        "      20  2 4 2                                                                      100 4 5 4                 94  1623      "     2.29(3H), 2.80(3H), 6.49(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 3 3 4                 95  1625      "     2.27(3H), 2.77(3H), 6.45(1H, 5-H)                                                                        "      20  1 4 4                                                                      100 3 4 4                 96  1627      "     2.29(3H), 2.79(3H), 3.74(3H), 6.46(1H,                                                                   "-H)   20  1 1 3                                                                      100 1 2 4                 97  1627, 1647                                                                               "     2.29(3H), 2.79(3H), 3.73(3H), 6.45(1H,                                                                   CDCl.sub.3                                                                            20  1 1 1                                                               DMSO-d.sub.6                                                                          100 1 2 2                 98  1625      "     2.27(3H), 2.31(3H), 2.78(3H), 6.48(1H,                                                                   CDCl.sub.3                                                                            20  1 3 3                                                                      100 1 4 4                 99  1620, 1650                                                                               "     2.28(3H), 2.31(3H), 2.79(3H), 6.47(1H,                                                                   "-H)   20  2 2 1                                                                      100 2 4 1                 100 1625, 1653                                                                               "     2.45(3H), 2.92(3H), 6.43(1H, 5-H)                                                                        "      20  1 2 4                                                                      100 2 2 4                 101 1627, 1653                                                                               "     2.31(3H), 2.80(3H), 6.47(1H, 5-H)                                                                        "      20  1 1 2                                                                      100 2 2 4                 102 1627, 1657                                                                               "     2.39(3H), 2.85(3H), 6.36(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 2 4 3                 103 1625, 1657                                                                               Neat  2.32(3H), 2.90(3H), 6.40(1H, 5-H)                                                                        "      20  4 4 4                                                                      100 5 4 4                 104 1617, 1663                                                                               KBr   2.44(3H), 2.88(3H), 6.37(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  1 1 1                                                               DMSO-d.sub.6                                                                          100 1 2 2                 105 1627, 1655                                                                               Neat  2.40(3H), 2.87(3H), 3.29(3H), 6.40(1H,                                                                   CDCl.sub.3                                                                            20  1 2 3                                                                      100 2 3 4                 106 1627      KBr   2.41(3H), 2.87(3H), 6.40(1H, 5-H)                                                                        "      20  4 4 3                                                                      100 4 4 4                 107 1625, 1655                                                                               "     2.43(3H), 2.92(3H), 6.42(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 3 4 3                 108 1633      "     2.40(3H), 2.89(3H), 3.31(3H), 6.40(1H,                                                                   "-H)   20  1 4 4                                                                      100 4 5 4                 109 1633, 1663                                                                               "     2.40(3H), 2.89(3H), 6.40(1H, 5-H)                                                                        "      20  1 3 4                                                                      100 4 4 4                 110 1633, 1663                                                                               "     2.40(3H), 2.88(3H), 6.36(1H, 5-H)                                                                        "      20  1 4 3                                                                      100 4 4 3                 111 1625, 1655                                                                               Neat  2.40(3H), 2.89(3H), 6.40(1H, 5-H)                                                                        "      20  1 2 3                                                                      100 2 4 4                 112 1630, 1660                                                                               KBr   2.21(6H), 2.41(3H), 2.90(3H), 6.42(1H,                                                                   "-H)   20  1 1 1                                                                      100 2 1 3                 113 1647      "     1.85(3H), 2.60(3H), 6.19(1H, 5-H)                                                                        "      20  1 1 3                                                                      100 1 1 5                 114 1627      "     2.32(3H), 2.79(3H), 6.41(1H, 5-H)                                                                        "      20  1 2 1                                                                      100 1 3 3                 115 1633, 1645                                                                               "     2.29(3H), 2.78(3H), 6.47(1H, 5-H)                                                                        "      20  1 1 2                                                                      100 2 3 2                 116 1630, 1647                                                                               "     2.26(3H), 2.73(3H), 6.43(1H, 5-H)                                                                        "      20  1 2 1                                                                      100 1 2 1                 117 1630, 1647                                                                               "     2.31(3H), 2.78(3H), 3.75(3H), 6.44(1H,                                                                   CDCl.sub.3                                                                            20  1 1 1                                                               DMSO-d.sub.6                                                                          100 1 1 2                 118 1630, 1647                                                                               "     2.30(6H), 2.77(3H), 6.47(1H, 5-H)                                                                        CDCl.sub.3 +                                                                   DMSO-d.sub.6                     119 1627, 1673                                                                               "     2.30(3H), 2.36(3H), 2.86(3H), 6.38(1H,                                                                   CDCl.sub.3                                                                            20  1 2 4                                                                      100 1 3 4                 120 1627, 1663                                                                               "     2.33(6H), 2.91(3H), 6.36(1H, 5-H)                                                                        "      20  1 4 4                                                                      100 2 4 4                 121 1627, 1657                                                                               "     2.27(3H), 2.39(3H), 2.84(3H), 6.46(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 4 2                 122 1627, 1670                                                                               "     2.25(3H), 2.38(3H), 2.81(3H), 6.43(1H,                                                                   "-H)   20  1 2 1                                                                      100 1 2 1                 123 1647      "     2.27(3H), 2.77(3H), 6.23(1H, 5-H)                                                                        CDCl.sub.3 +                                                                   DMSO-d.sub.6                     124 1627, 1670                                                                               "     2.34(3H), 2.87(3H), 6.34(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  1 3 3                                                                      100 2 4 4                 125 1623, 1653                                                                               "     2.23(3H), 2.77(3H), 6.41(1H, 5-H)                                                                        "      20  3 4 1                                                                      100 3 4 1                 126 1627, 1665                                                                               "     2.26(3H), 2.78(3H), 6.46(1H, 5-H)                                                                        "      20  1 4 1                                                                      100 1 4 1                 127 1630, 1665                                                                               "     2.26(3H), 2.80(3H), 6.46(1H, 5-H)                                                                        "      20  1 3 1                                                                      100 1 4 1                 128 1633, 1670                                                                               "     2.26(3H), 2.79(3H), 6.44(1H, 5-H)                                                                        "      20  4 4 1                                                                      100 4 4 1                 129 1605, 1627, 1663                                                                         "     2.25(3H), 2.78(3H), 3.79(3H), 6.41(1H,                                                                   "-H)   20  3 4 1                                                                      100 4 4 1                 130 1627, 1663                                                                               "     2.28(3H), 2.81(3H), 3.73(3H), 6.46(1H,                                                                   "-H)   20  2 4 1                                                                      100 3 4 1                 131 1625, 1655                                                                               "     2.27(3H), 2.29(3H), 2.80(3H), 6.47(1H,                                                                   "-H)   20  3 3 1                                                                      100 3 3 1                 132 1630, 1663                                                                               "     2.26(3H), 2.31(3H), 2.80(3H), 6.43(1H,                                                                   "-H)   20  4 4 1                                                                      100 4 4 1                 133 1630, 1663                                                                               "     2.27(3H), 2.80(3H), 6.43(1H, 5-H)                                                                        "      20  1 3 2                                                                      100 1 4 1                 134 1633, 1660                                                                               "     1.27(9H), 2.29(3H), 2.82(3H), 6.45(1H,                                                                   "-H)                             135 1627, 1667                                                                               "     2.42(3H), 2.92(3H), 6.39(1H, 5-H)                                                                        "      20  1 2 1                                                                      100 2 3 3                 136 1630, 1670                                                                               "     2.28(3H), 2.80(3H), 6.43(1H, 5-H)                                                                        "      20  4 4 1                                                                      100 4 4 1                 137 1627, 1665                                                                               "     2.27(3H), 2.79(3H), 6.44(1H, 5-H)                                                                        "      20  1 1 1                                                                      100 1 3 1                 138 1625, 1657                                                                               "     2.28(3H), 2.80(3H), 6.45(1H, 5-H)                                                                        "      20  1 4 1                                                                      100 4 4 1                 139 1627, 1663                                                                               "     2.38(3H), 2.89(3H), 6.39(1H, 5-H)                                                                        "      20  1 1 3                                                                      100 1 1 4                 140 1623, 1655                                                                               "                                      20  1 4 1                                                                      100 1 4 1                 141 1630, 1657                                                                               "     2.24(3H), 2.27(3H), 2.77(3H), 6.43(1H,                                                                   "-H)   20  1 4 1                                                                      100 1 4 1                 142 1627, 1665                                                                               "     2.39(3H), 2.89(3H), 6.38(1H, 5-H)                                                                        "      20  1 3 4                                                                      100 1 3 4                 143 1627, 1665                                                                               "                                      20  1 3 1                                                                      100 1 3 1                 144 1625, 1660                                                                               "                                      20  1 2 1                                                                      100 1 2 1                 145 1625, 1660                                                                               "     2.27(3H), 2.30(3H), 2.80(3H), 6.47(1H,                                                                   "-H)   20  1 1 1                                                                      100 1 2 1                 146 1625, 1655                                                                               "     2.29(3H), 2.90(3H), 6.35(1H, 5-H)                                                                        "      20  1 3 1                                                                      100 1 3 1                 147 1627, 1655                                                                               "     2.37(3H), 2.89(3H), 6.37(1H, 5-H)                                                                        "      20  1 4 4                                                                      100 2 4 4                 148 1625, 1660                                                                               "     2.27(3H), 2.80(3H), 6.45(1H, 5-H)                                                                        "      20  1 2 2                                                                      100 2 3 3                 149 1625, 1663                                                                               "                                                                150 1633, 1663                                                                               "                                                                151 1630, 1675                                                                               "     2.38(3H), 2.89(3H), 6.38(1H, 5-H)                                                                        "      20  1 4 4                                                                      100 1 4 4                 152 1633, 1667                                                                               "     2.30(3H), 2.81(3H), 6.49(1H, 5-H)                                                                        "      20  1 4 1                                                                      100 3 4 3                 153 1635, 1673                                                                               "     2.29(3H), 2.80(3H), 6.49(1H, 5-H)                                                                        "      20  2 4 1                                                                      100 2 4 1                 154 1633, 1673                                                                               "     2.29(6H), 2.80(3H), 6.44(1H, 5-H)                                                                        "      20  4 4 1                                                                      100 4 4 4                 155 1627, 1655                                                                               "     2.33(3H), 2.86(3H), 3.90(3H), 6.35(1H,                                                                   "-H)   20  1 1 2                                                                      100 1 2 2                 156 1643      "     2.24(3H), 2.78(3H), 3.91(3H), 6.43(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 4 1                 157 1623, 1653                                                                               "                                      20  1 4 1                                                                      100 1 4 1                 158 1625, 1655                                                                               "                                      20  3 4 1                                                                      100 4 4 1                 159 1627, 1670                                                                               "     2.15(3H), 2.72(3H), 6.34(1H, 5-H)                                                                        "      20  1 1 1                                                                      100 1 2 1                 160 1627, 1673                                                                               "     2.15(3H), 2.69(3H), 6.31(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  1 1 1                                                               DMSO-d.sub.6                                                                          100 1 2 1                 161 1627, 1670                                                                               "     2.14(3H), 2.27(3H), 2.71(3H), 6.32(1H,                                                                   CDCl.sub.3                                                                            20  1 1 1                                                                      100 1 2 1                 162 1605, 1630, 1673                                                                         "     2.27(3H), 2.36(3H), 6.27(1H, 5-H)                                                                        DMSO-d.sub.6                     163 1650      "     2.22(3H), 2.37(3H), 6.16(1H, 5-H)                                                                        CD.sub.3 OD                      164 1627      "     1.78(3H), 2.21(3H), 6.07(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  1 1 1                                                                      100 1 2 1                 165 1607, 1640, 1665,                                                                        "     2.24(3H), 2.60(3H), 3.84(3H), 6.22(1H,                                                                   CDCl.sub.3                                                                            20  1 1 5                     1690, 1707                                CD.sub.3 OD                                                                           100 1 1 5                 166 1600, 1620, 1643,                                                                        "     2.24(3H), 2.53(3H), 3.87(3H), 6.39(1H,                                                                   CDCl.sub.3                                                                            20  1 4 1                     1703                                             100 2 4 1                 167 1605, 1627, 1667,                                                                        "                                      20  1 4 1                     1707                                             100 2 4 3                 168 1607, 1627, 1663,                                                                        "                                      20  2 4 1                     1700                                             100 3 4 1                 169 1617, 1675                                                                               "     2.35(3H), 2.40(3H), 2.91(3H), 6.36(1H,                                                                   "-H)   20  3 4 4                                                                      100 4 4 4                 170 1625, 1675                                                                               "     2.35(3H), 2.39(3H), 2.90(3H), 6.34(1H,                                                                   "-H)   20  4 4 3                                                                      100 4 4 3                 171 1627, 1667                                                                               "     2.40(6H), 2.92(3H), 6.36(1H, 5-H)                                                                        "      20  1 4 2                                                                      100 3 4 2                 172 1615, 1673                                                                               "     2.34(3H), 2.68(3H), 2.71(3H), 5.71(1H,                                                                   CD.sub.3 OD                                                                           20  4 4 1                                                                      100 4 4 1                 173 1625, 1653                                                                               "     2.29(3H), 2.40(3H), 2.83(3H), 6.43(1H,                                                                   CDCl.sub.3                                                                            20  3 4 1                                                                      100 4 4 1                 174 1627, 1660                                                                               "     2.23(3H), 2.40(3H), 2.79(3H), 6.40(1H,                                                                   "-H)   20  1 1 1                                                                      100 1 4 1                 175 1607, 1630, 1660                                                                         "     2.46(3H), 2.91(3H), 6.38(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 2 4 4                 176 1625, 1653                                                                               "     2.27(3H), 2.92(3H), 6.32(1H, 5-H)                                                                        "      20  4 4 4                                                                      100 4 4 4                 177 1607, 1623, 1655                                                                         "     2.27(6H), 2.35(3H), 2.89(3H), 6.35(1H,                                                                   "-H)   20  2 4 4                                                                      100 4 4 4                 178 1607, 1625, 1653                                                                         "     2.28(6H), 2.36(3H), 2.90(3H), 6.37(1H,                                                                   "-H)   20  3 4 4                                                                      100 4 4 4                 179 1607, 1625, 1660                                                                         "     2.29(6H), 2.41(3H), 2.91(3H), 6.36(1H,                                                                   "-H)   20  1 4 3                                                                      100 3 5 3                 180 1613, 1633, 1663                                                                         "     2.27(6H), 2.94(3H), 6.36(1H, 5-H)                                                                        "      20  3 5 4                                                                      100 4 5 4                 181 1603, 1627, 1657                                                                         "     2.23(3H), 2.29(6H), 2.77(3H), 6.41(1H,                                                                   "-H)   20  1 3 1                                                                      100 1 4 1                 182 1623, 1660                                                                               "     2.29(6H), 2.35(3H), 2.94(3H), 6.33(1H,                                                                   "-H)   20  1 3 1                                                                      100 3 4 2                 183 1620, 1667                                                                               "     2.39(3H), 2.31(3H), 2.32(3H),                                                                            CDCl.sub.3                                                                            20  1 2 4                                     2.91(3H), 6.34(1H, 5-H)   DMSO-d.sub.6                                                                          100 1 2 4                 184 1637, 1665                                                                               "     2.34(6H), 2.97(3H), 6.34(1H, 5-H)                                                                        CDCl.sub.3                                                                            20  4 4 4                                                                      100 5 4 4                 185 1617, 1657                                                                               "     2.28(6H), 2.39(3H), 2.89(3H), 6.38(1H,                                                                   " H)   20  1 4 4                                                                      100 4 4 4                 186 1620, 1660                                                                               "     2.29(6H), 2.41(3H), 2.88(3H), 6.38(1H,                                                                   "-H)   20  2 4 3                                                                      100 2 4 3                 187 1620, 1660                                                                               "     2.27(3H), 2.37(3H), 2.87(3H), 6.39(1H,                                                                   "-H)   20  1 3 3                                                                      100 4 4 4                 188 1627, 1655                                                                               "     2.28(3H), 2.39(3H), 2.89(3H), 6.42(1H,                                                                   "-H)   20  2 3 3                                                                      100 4 4 3                 189 1633      "     2.27(3H), 2.41(3H), 2.88(3H), 6.40(1H,                                                                   "-H)   20  1 2 3                                                                      100 3 4 3                 190 1643      "     2.49(3H), 2.78(3H), 7.00(1H, 5-H)                                                                        "      20  1 4 3                                                                      100 3 4 3                 191 1620, 1673                                                                               "     2.53(3H), 2.69(3H), 7.25(1H, 5-H)                                                                        "      20  1 3 3                                                                      100 3 4 3                 192 1623      "     2.32(3H), 2.90(3H), 6.40(1H, 5-H)                                                                        "      20  1 5 4                                                                      100 2 5 4                 193 1627      "     2.39(3H), 2.93(3H), 6.37(1H, 5-H)                                                                        "      20  2 3 4                                                                      100 3 4 4                 194 1620      "     2.20(3H), 2.77(3H), 6.34(1H, 5-H)                                                                        "      20  4 5 4                                                                      100 4 5 4                 195 1633, 1660                                                                               neat  2.28(3H), 2.80(3H), 6.34(1H, 5-H)                                                                        "      20  2 4 4                                                                      100 4 4 4                 196 1627, 1643                                                                               KBr   2.36(3H), 2.86(3H), 6.41(1H, 5-H)                                                                        "      20  1 1 3                                                                      100 3 3 3                 197 1627, 1655                                                                               "     2.01(3H), 2.95(3H), 6.41(1H, 5-H)                                                                        "      20  1 2 4                                                                      100 2 3 4                 198 1607, 1617, 1657                                                                         "     2.27(3H), 2.45(3H), 2.81(3H), 6.45(1H,                                                                   "-H)   20  4 4 4                                                                      100 4 4 4                 199 1627, 1657                                                                               "     2.30(3H), 2.32(3H), 2.49(3H),                                                                            "      20  4 4 1                                     2.85(3H), 6.50(1H, 5-H)          100 4 4 1                 200 1603, 1623, 1670                                                                         "     2.39(3H), 2.45(3H), 2.92(3H), 6.39(1H,                                                                   "-H)   20  1 4 4                                                                      100 1 4 4                 201 1600, 1623, 1660                                                                         "     2.32(3H), 2.46(3H), 2.98(3H), 6.40(1H,                                                                   "-H)   20  4 5 4                                                                      100 4 5 4                 202 1630, 1657                                                                               "     2.29(3H), 2.35(3H), 2.96(3H), 6.32(1H, (1H,                                                              "-H)   20  1 4 4                                                                      100 1 4 4                 203 1625, 1665                                                                               "     2.29(6H), 2.90(3H), 6.36(1H, 5-H)                                                                        "      20  4 5 4                                                                      100 4 5 4                 204 1633, 1673                                                                               "     2.37(3H), 2.89(3H), 6.37(1H, 5-H)                                                                        "      20  1 4 4                                                                      100 1 4 4                 205 1627, 1675                                                                               "     2.35(3H), 2.88(3H), 6.35(1H, 5-H)                                                                        "      20  1 4 1                                                                      100 1 4 1                 206 1637, 1667                                                                               "     2.29(3H), 2.90(3H), 6.33(1H, 5-H)                                                                        "      20  4 5 4                                                                      100 4 5 4                 207 1627, 1673                                                                               "     2.39(3H), 2.91(3H), 6.43(1H, 5-H)                                                                        "      20  2 4 1                                                                      100 3 4 3                 208 1630, 1663                                                                               "     2.31(3H), 2.90(3H), 6.36(1H, 5-H)                                                                        "      20  2 3 3                                                                      100 4 3 3                 209 1625, 1670                                                                               "     2.35(3H), 2.97(3H), 6.44(1H, 5-H)                                                                        "      20  1 2 4                                                                      100 1 3 4                 210 1600, 1627, 1663                                                                         "     2.27(3H), 2.90(3H), 3.85(3H), 6.32(1H,                                                                   "-H)   20  1 1 1                                                                      100 1 4 4                 211 1610, 1633, 1677                                                                         "     2.32(3H), 2.61(3H), 3.85(3H), 6.29(1H,                                                                   "-H)   20  1 1 3                                                                      100 1 2 4                 212 1607, 1635, 1660                                                                         "     2.27(3H), 2.61(3H), 3.83(3H), 6.27(1H,                                                                   "-H)   20  1 1 1                                                                      100 2 4 4                 213 1625, 1650                                                                               neat  2.40(3H), 2.85(3H), 6.35(1H, 5-H)                                                                        "      20                                                                             100                       214 1630, 1660                                                                               KBr   2.37(3H), 2.99(3H), 6.31(1H, 5-H)                                                                        "      20  1 1 2                                                                      100 1 2 2                 215 1628, 1665                                                                               "     2.40(3H), 2.97(3H), 6.33(1H, 5-H)                                                                        "      20  4 5 4                                                                      100 5 5 4                 216 1625, 1652                                                                               "     2.39(3H), 2.92(3H), 3.91(3H), 6.32(1H,                                                                   "-H)   20  2 3 4                                                                      100 3 4 5                 217 1627, 1663                                                                               neat  2.39(3H), 2.90(3H), 6.34(1H, 5-H)                                                                        "      20  4 4 4                                                                      100 4 4 4                 __________________________________________________________________________      X: Oryza sativa L.                                                             Y: Echinochloa crusgalli L.                                                    Z: Raphanus sativus L.                                                    

What we claim is:
 1. A method for inhibiting plant growth comprising treating the plant or its seed with a plant growth inhibitory-effective amount of a compound of the formula (I) ##STR11## or a salt thereof wherein R is (a) a hydrogen atom, (b) an alkoxy group, (c) an aralkyloxy group selected from the group consisting of phenylmethoxy, phenethyloxy, phenylpropoxy, or phenylbutoxy which may be substituted by an alkyl or a halogen atom on the aryl ring, or (d) a group of --(CH₂)_(n) --R₁ wherein n is an integer from 1 to 3 and R₁ is a hydrogen atom, hydroxy group, lower alkoxy group, mercapto group, lower alkylthio group, amino group, di-lower alkylamino group, C₃₋₁₁ alkyl group, lower alkenyl group, lower alkynyl group, cycloalkyl group, a furyl or pyridyl group which may be substituted by halogen, lower alkyl, or phenyl, or a phenyl or naphthyl group which may be substituted by one or two substituents of halogen, lower alkyl, or lower alkoxy;R₂ is a halogen atom, lower alkyl group, hydroxy group, lower alkoxy group, aryloxy group, carboxy group, or lower alkoxy-carbonyl group; and R₃ is a hydrogen atom, halogen atom, or lower alkyl group.
 2. A method for inhibiting plant growth according to claim 1 wherein the lower alkyl, lower alkenyl, lower alkynyl, or lower alkoxy group in R₁, R₂, and R₃ of the formula (I) compound has from 1 to 5 carbon atoms.
 3. A method for inhibiting plant growth according to claim 1 wherein in the formula (I) compound, R₁ is phenyl and R₂ is phenyloxy.
 4. A method for inhibiting plant growth according to claim 1 wherein R₁ in the formula (I) compound is a furyl or pyridyl group.
 5. A method for inhibiting plant growth according to claim 1 wherein the formula (I) compound is 1-butyl-N-(2,6-diethylphenyl)-1,4-dihydro-1,6-dimethyl-4-oxo-3-pyridinecarboxamide,N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-1-isobutyl-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-1-isopentyl-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1-allyl-N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo 1-(2-propynyl)-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1-(4-fluorophenylmethyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamde, N-(2,6-diethylphenyl)1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(3-phenylpropyl)-3-pyridinecarboxamide, N-(2,6-dimethylphenyl)-1,4-dihydro-1-(2-methoxyethyl)-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-1-(3-methoxypropyl)-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1-butyl-1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-3-pyridinecarboxamide, 1-(4-chlorophenylmethyl)-1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-1-(3-methylphenylmethyl)-4-oxo-3-pyridinecarboxamide, 1,4-dihydro-1-(3-methoxyphenylmethyl)-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-phenylmethyl-3-pyridinecarboxamide, 1-butyl-N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2-ethyl-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, 1-butyl-1,4-dihydro-2,6-dimethyl-N-(2,3-dimethylphenyl)-4-oxo-3-pyridinecarboxamide, or 1-butyl-1,4-dihydro-2,6-dimethyl-N-(2,4-dimethylphenyl)-4-oxo-3-pyridinecarboxamide, or a salt thereof.
 6. A compound of the formula (I) ##STR12## or a salt thereof wherein R is a C₄₋₆ alkyl group, a C₂₋₃ alkyl group substituted by phenyl or phenyl having either one of halogen or methyl, a C₁₋₃ alkyl group substituted by cycloalkyl, or a lower alkoxy group which may be substituted by phenyl;R₂ is a halogen atom, or methyl or ethyl group; and R₃ is a hydrogen atom, a halogen atom, or a methyl or ethyl group.
 7. A compound of claim 6 wherein ##STR13## is 2-ethylphenyl or 2,6-diethylphenyl.
 8. A compound of claim 6 wherein ##STR14## is 2-methylphenyl, 2-methyl-3 (or 5 or 6)-methylphenyl, or 2-methyl-3-chlorophenyl.
 9. A compound of claim 6 wherein ##STR15## is 2-chlorophenyl, 2-chloro-3 (or 6)-chlorophenyl, or 2-chloro-6-methylphenyl.
 10. A compound of claim 6 which is 1-butyl-1,4-dihydro-2,6-dimethyl-N-(2,5-dimethylphenyl)-4-oxo-3-pyridinecarboxamide,1-butyl-N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1-butyl-N-(2-chloro-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-N-(2,3-dimethylphenyl)-4-oxo-1-pentyl-3-pyridinecarboxamide,
 1. 4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-pentyl-3-pyridinecarboxamide,N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-pentyl-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1-hexyl-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2-ethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-N-(2,3-dimethylphenyl)-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, 1,4-dihydro-2,6-dimethyl-N-(2,6-dimethylphenyl)-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, N-(2-chloro-6-methylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(2-phenylethyl)-3-pyridinecarboxamide, N-(2-chlorophenyl)-1,4-dihydro-2,6-dimethyl-4-oxo 1-(2-phenylethyl)-3-pyridinecarboxamide, 1-[2-(2-chlorophenylethyl)]-N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, 1-[2-(4-chlorophenylethyl)]-N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-3-pyridinecarboxamide, N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-(3-phenylpropyl)-3-pyridinecarboxamide or N-(2,6-diethylphenyl)-1,4-dihydro-2,6-dimethyl-4-oxo-1-phenylmethyloxy-3-pyridinecarboxamide, or a salt thereof. 